An earthquake measuring 7.1 on the Richter scale was registered early Saturday off the Kamchatka Peninsula, in Russia's Far East, the regional emergencies ministry office said.

Officials said no casualties, destruction or tsunami threat have been reported following the quake, which occurred at 06:10 a.m. Moscow time (02:10 a.m. GMT) in the Sea of Okhotsk, 400 kilometers (about 250 miles) from the regional center Petropavlovsk-Kamchatsky, where the tremors measured 4.0 on the Richter scale and lasted for three minutes.

Kamchatka is one of Russia's most seismically unstable regions. According to experts, there are more than 150 volcanoes on Kamchatka, 29 of them active.

On April 21 2006, a 7.8-magnitude quake in the north of the Kamchatka Peninsula, the most powerful since 1900, injured 31 people. It also damaged about 380 houses and 25 administrative facilities in several towns.